The bq25071-Q1 is a highly integrated, linear, LiFePO4 battery
charger targeted at space-limited automotive applications. It accepts power from either a USB port
or AC adapter and charges a single-cell LiFePO4 battery with up to 1 A of
charge current. The 30-V input rating supports low-cost unregulated adapters.
The bq25071-Q1 has a single power output that simultaneously charges the battery and
powers the system. The input current is programmable from 100 mA up to 1 A using the ISET input or
configurable for USB500. There is also a 4.9 V ±10% 50 mA LDO integrated into the IC for supplying
low power external circuitry.
The LiFePO4 charging algorithm removes the current taper typically
seen as part of the constant voltage mode control used in Li-Ion battery charge cycles which
reduces charge time significantly. Instead, the battery is fast charged to the overcharge voltage
and then allowed to relax to a lower float charge voltage threshold. The charger integrates the
power stage with the charge current and voltage sense to achieve a high level of accuracy in the
current and voltage regulation loops. An internal control loop monitors the IC junction temperature
through the charge cycle and reduces the charge current if an internal temperature threshold is
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